How do you do it? Can't seem to find any screws or anything..

hmm... drill.

yep, they are riveted in, why remove it?

there are some wax residue on the side of the gas lid that i can't reach..

im sure i know what you mean, just get a q-tip!

yes Qtip or tooth brush

yeah i drilled one out at a yard just to have a spare, its a PITA just take your time